Method of receiving, amplifying, and detecting oscillatory energy



Dec. 15, 1931. HUBBELL 1,836,323

METHOD OF RECEIVING, AMPLIFYING, AND DETECTING OSCILLATORY ENERGY Filed May 1, 1928 dun- ||||l l I i! 4,. 4 INVENTOR Patented Dec, 15, 1931 LEROY s. HUBBELL, o1;-

FRANCISCO, GALIEFORNIA i i Memos or nncmvrn AiqrrnmY-me, Ann mmcme bscn mmommsmzf A pnaaon fiied 'ua fiQ 193 s. seria nbizviaasgj This invention relates ,tothemethod of re ceiving, amplifying and detecting hi n free quencyelectrical oscillatory energy yam plifying bothhalves of the incoming wave,

further amplifying the amplified wave by a regenerative couplingto the same stage of amplification and simultaneously detecting both halves of :the amplified wave.

n The main purpose of this invention is to :5 convert the incominghigh frequency wave to a wave of audible frequency in the most efiicientmanner. Itis well known in theart that appreciable lossesfare incurredin the couplings between stagesof amplificationto j 13 gether with the attendeddifiiculty, if one con trol is desired, ofitunin the successive stages. In this invention it is proposedtoreceive,

amplifyand detect the incoining'wave in one stage, the audible frequency'resulting theref 20 from beingfurther amplifiedfif desired, in the usual manner. By this means only one. t'uningcondenser and'one stage ofhigh fre-l quency amplification is required, 1 The antenna is of the aperiodictype, two or three a; separate'antenn'as being-required for maximum results. r

The circuit used is offthe regenerativetype and can be made very selective by the proper adjustment between the source of incoming 30 oscillations and the input circuit and by minimizing the amount of resistance in the tuned circuits. In view of the high degree of 'se-l lectivity which may be obtained, it possible 7. .and may even be desirable inrece'iving ti 93 "'paratus remotely located from the broadcasting station, to interpose between the circuit arrangement disclosed herein and the source of incoming oscillationsone or more stages of untuned radio frequency amplification. p

1 Theprincipal circuit connections of the apparatus are shown in the drawing, WhQfGCOll 1 represents thesourcefof the incoming oscil lations; Energy from coil 1 isinduced to coils 2 and 3 which areiconnected together with theirfields aiding,the'other leads from the coils 2and3being connected to the varif able condenser8 and the grids 9 and 10. Now."

as a potential is impressed upon 9; a potential of opposite polarity is impressed upon grid lOcausing a correspondmg'im crease and decrease in the current in plate leads11and 12; These leads are connected to coils 4 and 5 in such manner that the change in plate currents cause a change in the fields of coils 4 and5 to aid the currents.

in coils 2 and 3) 'Suflicie'nt capacity exists between coils 2 and 4, 3 and 5, and the windi ingsof coils 6 and 7 to permit the circuit to re generate, the undesirable oscillations "being minimized by the radio frequency'choke coils 6 and 7 The grids 9 and 10 are connected tojthe filaments :of the tubes 16 and17 at a" 7 center tap between coils 2 and 3 andthrough grid capacityland associated grid leak resist-J ance 13. fGridcapacity and, grid leak resistance 1-3 thus serve both grids in common.

Simultaneous detection ta es placethrouglr both tubes in parallelf A claim:

" 1.*" '-Ihe inethod of receiving, amplifying and detecting high frequency electrical 0scillatory energy which comprises an ampliQ Y fication of both halves of the wave of the 'incomin energy, each half wave being further; ampli ed by the regenerative coupling of the" other half, wave'and a detection of both amplified waves simultaneously;

a 2.111 a radio receiving system, thecombination of a plurality of windings inductively coupled, a tuning condenser connected across the grid leads of two vacuum tubes, the grid and plate leads ofsaid vacuum" tubes connecting with'thesaid plurality of windings, a' grid condenser 'and grid leak re sistance common tothe grids of both of said vacuum tubes, radio frequency choke, inductances interposed between the plate" leads andthe common audio frequency lead said combination detecting and regenerating both halves of the incoming wave.

ingconden'ser connected across the grid leads of two vacuum tubes, the grid and plate leads of said vacuum tubes connecting with the said plurality of windings, a grid condenser and grid leak resistance common to 1 the grids of both of said vacuum tubes, radio frequency choke inductances interposed beon" 3;In afradio receiving system, the combinationof ,a'n aperiodic antenna, a plural ity of v windings inductively coupled, a tun-' r we a tween plate' leads and the common audio frequency lead said combination detecting and regenerating both halves of the incoming wave.

4:. A selective receiving system for receiving oscillations of radiant energy comprising an antenna circuit, an input circuit coupled thereto and resonant to the frequency to be detected, two grids having a common grid to filament lead and connected in diametric phase relation to each other to said input circuit, two plates symmetrically associated'withsaid grids, said plates being connected together through a series circuit coupled in phase to said input circuit and each of said plates being connected to a circuit converging on a commonplate to.

filament lead.

5. A selective receiving system for receiving oscillatlons of radiant energy comprising an antenna circuit, an input circuit cou-' pled thereto and resonant to the frequency to be detected, two grids having a common grid to filament lead, a capacitance and resistance in shunt and interposed in said lead, said grids connected in diametric phase rela-, tion to each other to said input circuit, two plates symmetrically associated with said grids, said plates being connectedtogether.

through a series circuit coupled in phase to said input circuit and each of said plates being connected to a circuit converging on a common plate to filament lead. a

6. A selective receiving system for receiv ing oscillations of radiant energy comprising an incoming source of current variations, an input circuit coupled thereto and resonant to the frequency to be detected, two grids having a common grid to filament lead and connected in diametric phase relation to each other to said input circuit, two plates symmetrically associated with said grids, said plates being connected together through a series circuit coupled in phase to said input circuit and each of said plates being connected to a circuit converging on a common plate to filament lead.

7. A selective receiving system for receiv- 7 mg oscillations of radiant energy compr1s-.

ing an incoming source of current variation,

an input circuit coupled thereto and resonant sociated with said grids, said plates being connected together through a series circuit coupled in phase to said input circuit and each of said plates being connectedtoa cir-,

cuit converging on a common plate to filament lead.

8. A selectlve receivlng system for receiving oscillations of radiant energy comprising an antenna circuit, an input circuit coupled thereto and resonant to the frequency to be detected, two grids having a common grid to filament lead and connected in diametric phase relation to each other to said input circuit, two plates symmetrically associated with said grids, said plates being connected together through a series circuit coupled in phase to said input circuit and each of said plates being connected to a circuit converging-on a common plate to filament lead, a

pairof filament circuits and a pair of impedances interposed symmetrically in each pair of said filament'circnits between sections ofelectronic emission and junction of said common leads. v

A selective receiving system for receiving oscillations of radiant energy comprising an antenna circuit, an input circuit coupled thereto and resonant to the frequency to be detected, two grids having a common grid to filament lead, a capacitance and resistance in shunt and interposed in said lead, said grids connected in diametric phase relation to each other to said input circuit, two plates symmetrically associated with said grids, said platesbeing connected together through a series circuit coupled in phase to said input circuit and each of said plates being connected. to a circuit converging on a common plate to filament lead, a pair of filament circuits and a pair-of impedances interposed symmetrically inv each pair of said filament circuits between sections of electronic emission and junction of said common leads.

10. A selective receiving system for receiving oscillations of radiant energy compris ing an incoming source of current variations, an input circuit coupled thereto and resonant to the frequency to be detected, two grids having a common grid to filament lead and connected in diametric phase relation to each other to said input circuit two plates symmetrically associated with said grids, said plates being connected together through a series circuit coupled in phase to said input circuit and each of said plates being connected to a circuit converging on a common plate to filament lead, a pair of filament circuits and a; pair of impedances interposed symmetrically in each pair of said filament circuits between sections of electronic emission and junction of said common leads,

11. A selective receiving system for receiving oscillations of radiant energy comprising anincoming source of current variation, an input circuit coupled thereto and resonant to the frequency to be detected, two grids having a common grid to filament lead, a capacitance and resistance in shunt and interposed in said lead, said grids connected in diametric phase relation to each other to said input circuit,two plates symmetrically associated with said grids, said plates being connected together through a series circuit coupled in 12. In a radio receiving system, a detector and regenerative amplifier stage, an incommg source of current variations an input C11- cu1t coupled thereto and resonant to the frequency to be detected, two grids having a two plates symmetrically associated with said common grid to filament lead, a capacitance and resistance in shunt and interposedin said lead, said grids connected in diametrlc phase relation to each other to said lnput circuit,

grids, said plates being connected together through a series circuit coupled in phase to said input circuit and each of said plates being connected to a circuit converging on a common plate to filament lead and an outgoing circuit associated with said common plate to filament lead.

13. In a radio receiving system, a detector and regenerative amplifier stage, an incoming source of current variations, an input circuit coupled thereto and resonant to the frequency to be detected, two grids having a common grid to filament lead, a capacitance and resistance in shunt and interposed in said lead, said grids connected in diametric phase relation to each other to said input circuit, two plates symmetrically associated with said grids, said plates beingconnected together through a series circuit coupled in phase to said input circuit and each of said plates being connected to a circuit converging on a common plate to filament lead and an outgoing circuit associated with said common plate to filament lead, a pair of filament circuits and a pair of impedances interposed symmetrically in each pair of said filament circuits between sections of electronic emission and junction of said common leads.

14. In a radio receiving system, a regenerative amplifier stage, an incoming source of current variations, an input circuit coupled thereto and resonant to the frequency to be detected, two grids havinga common grid to filament lead, a negative potential for said grids interposed in said lead, said grids connected in diametric phase relation to each other to said input circuit, two plates symmetrically associated with said grids, said plates being connected together through a series circuit coupled in phase to said input circuit and to'an outgoing circuit each of said plates being connected to a circuit converging on a common plate to filament lead.

15. In a radio receiving system, a regenerative amplifier stage, an incoming'source of current variations, an input circuit coupled detected,;two grids having a common grid to filament lead, a negative potential for said grids interposed in said lead, said grids connected in diametric phase relation to each other to said input circuit, two plates symmetrically associated with said grids, said plates being connected together through a series circuit coupled in phase to said input circuit and to an outgoing circuit each of said plates being connected to a circuit converging on a common plate to filament lead, a pair of filament circuits and a pair of impedances interposedsymmetrically in each pair of said filament circuits between sections of electronic emission and junction of said common leads.

16. A filter circuit comprising an incoming source of current variations, an input circuit coupled thereto and transparent to a band of frequencies to be amplified and opaque to others, two grids having a common grid to filament lead and connected in diametric phase relation to each other to said input circuit, two plates symmetrically associated with said grids, said plates being connected together through a series circuit coupled in phase to said input circuit andto an outgoing circuit each of said plates being connected to a circuit converging ona common plate to filament lead.

17 A'filter circuit comprising an incoming source of current variations, an input circuit coupled thereto and transparent to a band of frequencies to be amplified andopaque to others, two grids having a common grid to filament lead and connected in diametric phase relation to each other to said input LEROY S. HUBBELL.

thereto and resonant to the frequency to be 

